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Alaska Energy Authority
Bradley River
Water Quality Report
1991
BRADLEY LAKE
HYDROELECTRIC PROJECT
Federal Energy Regulatory Commission
Project No. P-8221-000
ALASKA ENERGY AUTHORITY
BRADLEY LAKE HYDROELECTRIC PROJECT
1991 BRADLEY RIVER WATER QUALITY REPORT
Prepared with
assistance from:
Northern Ecoloqical Services
Anchoraqe, Alaska
December, 1991
TABLE OF CONTENTS
Page
INTRODUCTION. • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 1
METHODS. • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 1
RESULTS ••.•••.••.• . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Riffle Reach. . . . . . . . . . . .
Tree Bar Reach.
North Fork •••.•
Miscellaneous Data. . . . . . . . . . . . . . . . .
... ... . . . . . . . . . . . .
2
2
2
3
3
RECOMMENDATIONS FOR FUTURE MONITORING ••.••••••••••••••••••••••. 3
REFERENCES. • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • . . • • • . • • • • • • • • • • • • • 3
i
LIST OF FIGURES
Page
Figure 1. Datapod locations, Bradley River •.••••.••••.•.••..•• 5
surface and Intragravel Water Temperature -Riffle Reach
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
December -1990. • • • • . • • • . • . . • • • • • • . • . • • . • • • • • • • • • • 6
January -1991....... . . • . . . . . . . • • • . . . . . . . • • . • • • • . . 7
February -1991. . • • • • • • • • • • . • • • • • • • • • • • • • • • . • • • • • • 8
March -19 91 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 9
April -1991..... . • • • • • • • . • • • • • • • • • • • • • • • • • • • • • • • . 10
May -1991 •••••••••••••.••••••••••••••••••••••••••• 11
J~e -1991.... . . . . • • • • • • • • . • • . . • • • • • . • • . • • • • • • • • • 12
July -1991..... . • • . . . • • . . . • • . • • • • • . • • • • • • • • • . • • • • 13
August -1991.... • . • • • . . • • • • • • • • • . • • • . . • • • • . • • • • . • 14
Septemller -1991. • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 15
October -1991........ . . . • • • . . • • • • • . • • • • . • • • • • . • . • 16
December-1990 through October-1991 •••••••••••• 17
Surface and Intragravel Water Temperature -Tree Bar Reach
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
April -1991. • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 18
May -1991 .••••••••••••••••••••••••••••••••••••••• 19
June -1991. • • • • • • • • • • • • • • • • • • • • . • • • • • • • • • • • • • • • • • 20
July -1991.... • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 21
August -1991............ . • • • • • . • • • • • • • • • • • • • • • • • • 22
Septemller -1991 ••••••••.•••••••••••••••••. • • • • • • • • 2 3
October -1991. • • • • • • • • • • • • • • • • • • • • • • • . • • • • • • • • • • • 24
Novemller -1991. • • • . • • • • • . • • • • • . • • • • • • • • • • • • • • • • • • 25
April-1991 through November-1991 ••••••••.••••• 26
surface water Temperature -Northfork
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
July -1991 •••••••••••••••••••••••••••••••••••••••
August -1991 ..................................... .
September ... 1991 •••••••••••.••••.••••••••••••••.••
October ... 1991 ••••••••••••••.•••••••••••••••••••.•
November -1991 •••••••••••••••••••••••••••••••••••
July -1991 through November -1991
LIST OF TABLES
27
28
29
30
31
32
Page
Table 1. Surface water temperature and turbidity measurements
collected during the Salmon Escapement Monitoring
study downstream from Riffle Reach ••••••••••••••••••• 33
ii
INTRODUCTION
The purpose of this report is to comply with Article 33 of the
Federal Energy Regulatory Commission (FERC) License which states
that a water quality monitoring program must be developed to
evaluate water temperatures in the lower Bradley River and heavy
metal and hydrogen sulfide concentration in Bradley Lake.
The monitoring program was developed and presented in the Bradley
Lake mitigation plan published in November 1985 (Alaska Energy
Authority, 1985). This is the sixth annual progress report and
covers water quality data collected during the period -December
1990 through November 1991.
Information presented includes intraqravel and surface water
temperatures in the Bradley River and surface water temperatures
in the North Fork of the Bradley River. Also included are surface
water temperature and turbid! ty measurements collected at the
Bradley River fish camp by the fisheries study crew during the July
to September period.
Filling of the Bradley Lake reservoir began in late 1990 and
continued through August of 1991. Power production was initiated
in September, 1991. Discharge volumes in the Bradley River during
the 1991 water quality monitoring period were characteristic of
operational flows. Therefore, this report is the first to report
on water quality during the operational flow regime.
IIETHODS
surface and intragravel water temperatures continued to be
collected at two-hour intervals utilizing Model DP212 Omnidata
Datapod digital recorders as described in the 1988 Annual Water
Quality Report (Alaska Power Authority, 1988). Figure 1 depicts
the locations of the temperature stations during 1991.
The data pods were serviced at approximately monthly intezyals.
Some variation in servicing interval occurred because of weather
limitations. The longest period between servicing was
approximately 6 weeks.
Additional surface water temperature and turbidity data were
collected during the mid-July to mid-September period by field
personnel associated with the Salmon Escapement Monitoring study.
This information was collected at the fish camp which is about 150
ft. downstream from the Tree Bar Reach datapod station.
Temperature readings were always collected at 8:00 am. Turbidity
was usually measured in mid-afternoon.
1
RESULTS
The intragravel and surface water temperature data for December
1990 through November 1991 are presented in graphic form by month
and by study site. An annual graph has also been produced for each
study site. Both the monthly and annual graphs were prepared using
a computer program which plots each of the 2 hour temperature
readings obtained from the da tapods. No averages were used in
plotting the data. Complete printouts of the data are not
presented here due to their bulk, but are available upon request
from the Alaska Energy Authority.
Riffle Reach
The record for Riffle Reach is complete except for the period from
october 9, 1991 to November 30, 1991. During this period a
malfunction occurred either in the data pod or the data storage
module (DSM) resulting in the retrieval of erroneous data.
Graphs of the surface and intragravel water temperatures for the
months December 1 1990 through October, 1991 are presented in
Figures 2 through 12 and the annual temperature record is presented
in Figure 13. It can be seen from the graphs that intragravel
temperature was 0.3 -0.6 degrees warmer than surface temperature
during the winter period. Following spring breakup in early April
and continuing until late August surface temperatures were somewhat
warmer on the average than intragravel temperatures. Diurnal
variation in surface water temperature was very evident during the
open water period.
Tree Bar Reach
As explained in the 1990 water quality report (Alaska Energy
Authority 1 1990), the Tree Bar Reach temperature probes were
damaged by high water in the late summer of 1990. High water and
ice conditions prevented the replacement of the probes until April,
1991. The datapod temperature record is complete from April
through November with no malfunction.
Graphs of the surface and intragravel water temperature for the
months April through November are presented in Figures 14 through
21 and the record for the full period April through November is
presented in Figure 22. The amplitude of the diurnal variation in
surface water temperature during the summer appeared to be
substantially greater at the Tree Bar Reach station than at Riffle
Reach. Intragravel temperatures during the summer were close to
the average of the surface temperature in contrast to the situation
at Riffle Reach where intragravel temperatures were generally
cooler than surface temperatures.
2
North Fork of the Bradley River
Freezing of the temperature probes combined with a series of
datapod malfunctions and leakage of water into the station box
caused the loss of data for the first half of the year. After two
datapod replacements the system again began functioning correctly
in late June. An additional loss of data occurred during the
period July 20 to August 15 because of weak batteries. The record
from mid-August to the end of November is complete.
Graphs of the surface water temperature for the months July through
November are presented in Figures 23 through 27 and the record for
the full period July through November is presented in Figure 28.
Miscellaneous Data
Surface water temperature and turbidity data collected during the
1991 Salmon Escapement Monitoring Program at the fish camp near
Tree Bar Reach are presented in Table 1.
RECOIIMBNDATIORS FOR FO"l'URE MORITORIRG
Water temperatures will continue to be monitored from Riffle Reach,
Tree Bar Reach and the Northfork of the Bradley River. Datapod
servicing frequency will continue to be once per month. Greater
effort will be made to anticipate datapod problems to increase the
success of data retrieval.
Water quality monitoring for heavy metal and hydrogen sulphide
concentrations in the Bradley Lake reservoir will be initiated in
the summer of 1992. Reservoir water chemistry data will be
collected in 1992 and again in 1995.
It is currently planned to prepare a final summary report in 1995
which summarizes pre-operational and post-operational water quality
data and addresses both water quality and fisheries concerns as
they may be related to the operation of the Bradley Lake
Hydroelectric Project.
Alaska Power Authority, 1985. Mitigation Plan for the Bradley Lake
Hydroelectric Project. Prepared by Stone & Webster Engineering
Corporation.
Alaska Power Authority, 1988. Bradley River Water Quality Report -
1988. Bradley lake Hydroelectric Project, Federal Energy
Regulatory Commission Project No. P-8221.
3
Alaska Energy Authority, 1990. Bradley River Water Quality Report-
1990. Bradley lake Hydroelectric Project, Federal Energy
Regulatory Commission Project No. P-8221.
4
BRADLEY RIVER SYSTEW
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A OAUPOC
PIQUII 1
Oataooct Locatlona, lradley River
-5-
.. .
FIGURE 2: RIFFLE REACH -DECEMBER, 1990
SURFACE & INTRAGRAVEL WATER TEMPERATURE
2~----------------------------------------~
1 . 8 ················································································--··················-············································································-············-··-·-········-······················ .. ·-
0 1 . 6 ···························································································································--······-··-·······---······-················-······-······-········-····-·························
C/) w ~ 1.4 ································································································-············-·························-·-···-·----···························--················--
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0. 4 ... ... ············-··-······-······················ ............................................................. .................................................... ........... . ..... .
5 10 1 2 25 30
DECEMBER -1990
1-SURFACE TEMPERATURE ··-··-INTRAGRAVEL TEMP.
-6-
FIGURE 3: RIFFLE REACH -JANUARY, 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
2~----------------------------------------~
1 .8 ········-·································································································-·······-····-·-·············---·············-·······-······----------····-···-··················
d 1 . 6 ··············································--··--····-·······································································-···--···--········-····---·-·······-·····--····-·--··-···········-····-
ffi ~ 1 . 4 ·············································································································-·······························---· ·-·-········-·-···--·-······--·····--·-·--
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5 1 1 20 25 30
JANUARY -1991
1-SURFACE TEMPERATURE ·········· INTRAGRAVEL TEMP.
-7-
FIGURE 4: RIFFLE REACH -FEBRUARY, 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
2~----------------------------------------~
1.8 ················································································································································································································································
0 1.6 ···························································································································································································-···················································
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1 .2 ··············································································································································-······-·-···-······-········-···············-··-·······-······--···-·-
1 ···········································································································································-·-···-····-···················-·-·-···········-··············-························· i 0.8 ······················································································································································-··············-···········-······-············-····································
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FEBRUARY -1991
1-SURFACE TEMPERATURE ·········· INTRAGRAVEL TEMP.
-a-
FIGURE 5: RIFFLE REACH -MARCH, 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
2~----------------------------------------~
1 . 8 ····-·································-··························································································································-·········-··-·-···········-···-····-·····························
d 1 . 6 ······························-·········································································································--··--·················-······-··--········-···············-·--·····-·-·······--··
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~ 1.2 .......................................................................................................................................................................... ·----···-···--····-··--
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5 10 25 30
MARCH -1991
1-SURFACE TEMPERATURE ·········· INTRAGRAVEL TEMP.
-9-
FIGURE 6: RIFFLE REACH -APRIL, 1991
SURFACE & INTAAGAAVEL WATER TEMPERATURE
3~----------------------------------------~
0 2. 5 ························--································-···············································································-···--·····················-·····-···-···························-··-··-····· .....
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5 10 15 20 2 30
APRIL -1991
-SURFACE TEMPERATURE ·········· INTRAGRAVEL TEMP.
-10-
FIGURE 7: RIFFLE REACH-MAY, 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
6~----------------------------------------~
(j 5 .............................................................................................................................................................................................................................................. .
(/) w w ffi 4 ························································································································································ ............... ··········· .................................... .
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5 10 1 2 2 3
MAY-1991
1-SURFACE TEMPERATURE ·········· INTRAGRAVEL TEMP.
-11-
FIGURE 8: RIFFLE REACH -JUNE, 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
10~----------------------------------------.
9 ·········································································································································--····--~----·--·····--·-················-··········-····-·-····-...
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1 ·····························································-···········-········--·-···-··-··········································································-··-························································
o~--.u~nn--nn~.nnn~--nn~--ann.~nnnn ...
5 10 15 2 25 30
JUNE-1991
1-SURFACE TEMPERATURE ---INTRAGRAVEL TEMP.
-12-
d
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FIGURE 9: RIFFLE REACH -JULY, 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
w 5 ·································································································································································-·················-····························-····························
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~ w a.
::! w .,_
4 ······································································································································································-········································································
3 ·························································································································-················-·················································································-················
2 ............................................................................................................................................................................................................................................... .
1 ·····································································································-·················································-······-··········-···························-·-······························-·
O~mnan~n.-.ma~m.n.-..u.umm.--.mn~-.-.-.._
5 10 IS 2 2 30
JULY-1991
1-SURFACE TEMPERATURE ·········· INTRAGRAVEL TEMP.
-13-
d en w w a:
(!) w
Cl
I
FIGURE 10: RIFFLE REACH -AUGUST, 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
12~-----------------------------------------.
w 6 ···································································································································-·--·-.. ·······························································································
a:
::)
~ w a.
:! w t-
4 ............................................................................................................................................................................................................................................... .
2 ················································································································································································································································
5 10 15 20
AUGUST -1991
1-SURFACE TEMPERATURE ·········· INTRAGRAVEL TEMP.
-14-
FIGURE 11: RIFFLE REACH -SEPT., 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
d
ffi w 7 ......................................................................................................................................... . .. ~ .. ::: .. .. . . . :-·-~.::.::::··--··································-·····
a: (!J -·r.: .. "" ..
w 6 ··································--················································································································-·················································----······ ................. . c
I w 5 ················································································································································-···-···················································-·········-·----···················
a: :::> ~ w
ll.
~
~
4 ............................................................................................................................................................................................................................................... .
3 .................................................................................................................................................................................................... , .......................................... .
2 .............................................................................................................................................................................................................................................. ..
1 ............................................................................................................................................................................................................................................... .
O~n..n~nn--nn~nnnn~--nnnq-..nna~mmmn-F
5 10 1 2 30
SEPTEMBER -1991
1-SURFACE TEMPERATURE .......... INTRAGRAVEL TEMP.
-15-
d
ffi w a:
FIGURE 12: RIFFLE REACH-OCT., 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
8~----------------------------------------~
7 ·················································································································································-··-····························-···············--·······································
Cl 5 ················································ .... ····--··························································-····································-···-········---·····················································-····· w
()
I
~ 4 ···········································--··································································----------------------························-···································--·································-·········
:::::;:)
~ 3 ............................................................................................................................................................................................................................................... .
w
~ 2 --------------------··············································································-·····································································································································-·····
w
1-
1 ------··········································································································································································································································
5 10 1 20 25 30
OCTOBER -1991
1-SURFACE TEMPERATURE ·········· INTRAGRAVEL TEMP.
-16-
0
en w w a:
(!) w
Cl
I
I .... w
-..J a:
I ::J
~ w a..
~ w t-
FIGURE 13: RIFFLE REACH-1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
1~~--------------------------------------------------~
10
2
0 I '·----··-zx '' I . I I I I I I _ I _ __ I ---I _ I
DECEMBER, 1990 THROUGH NOVEMBER, 1991
,_SURFACE TEMPERATU-RE .......... ~INTRAGRAVEL TEMP. I
0
en
FIGURE 14: TREEBAR REACH -APRIL, 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
4~--------------------~--------------------~
3.5 ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
3 ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
w 2.5--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------w a:
(!J w c
-0.5 ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-1~----~------~------~----~------.-----~ 5 10 25 3
APRIL-1991
1--SURFACE TEMPERATURE -----------INTRAGRAVEL TEMP.
-18-
cj
CJ) w
FIGURE 15: TREEBAR REACH-MAY, 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
6~------------------------~------------------~
5 ·············································································································································································································································
~ 4 ................... ············································································································· ............................................... ·······················-····· ········-·.
(!)
w
0
I
w a: ::> ~ w a..
:::! w
I-
' r .................................................. -------------------------------------------------------------------------
1 .............................................................................................................................................................................................................................................. .
5 10 15 25 30
MAY -1991
1--SURFACE TEMPERATURE ··········· INTRAGRAVEL TEMP.
-19-
0
C/) w w a:
~ w
Cl
I
w a:
:::J
~ w a..
~ w
I-
FIGURE 16: TREEBAR REACH -JUNE, 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
12~--------------------------------------------~
10 .......................................................................................................................................................................................................................................... .
8 ................................................................................................................................................................ ·····························································
5 10 30
JUNE-1991
1--SURFACE TEMPERATURE ··········· INTRAGRAVEL TEMP.
-20-
d
ffi w a:
ffi
0
I
FIGURE 17: TREEBAR REACH -JULY, 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
12~------------------------------------------~
w 6 ················································--········································································---·--······················-----··················-······-·········--·-·-········--··--················--···--
a:
::J
~ w 4 ······-···············-······-························································································--····················································································································
a..
::E
~
2 ······························--················································································································-··----·······-·········································································
5 10 15 20 25 3
JULY -1991
1-SURFACE TEMPERATURE ·-····-· INTRAGRAVEL TEMP.
-21-
0
(/) w
~
(!)
w
0
I
FIGURE 18: TREEBAR REACH -AUGUST, 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
12~--------------------------------------------~
w 6 ............................................................................................................................................................................................................................................. .
a:
:::::>
~ w 4 ··········································································································································································································-··································
11.
::! w
1-
2 ···················································································································································-·························································································
5 10 1 20 25 3
AUGUST -1991
1-SURFACE TEMPERATURE ··········· INTRAGRAVEL TEMP.
-22-
d
ffi w a: m
CJ
I
FIGURE 19: TREEBAR REACH -SEPT., 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
w 5 ·········································································································································-··········-···················································· ............................... .
a:
:::::> ~ w
CL
:E
~
4 ··································-··········································································································································································································
3 ··························································-··················································································--··-······················--··-·························································
2 ········································································································································-······-···--····················································································
1 ............................................................................................................................................................................................................................................. .
O~ma--~--~nm~------~--.---~anmm~.-----~ 5 10 1 20 2 3
SEPTEMBER -1991
1-SURFACE TEMPERATURE ··········· INTRAGRAVEL TEMP.
-23-
FIGURE 20: TREEBAR REACH-OCT., 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
10~----------------------------------------~
9 ··············································································································································································································································
cj 8 ............................................................................................................................................................................................................................................. .
CJ) ttl 7 ................. ·······················································································································································----················-·································-·····-
0::
CJ w
0
I
w a:
::::> ~ w a..
::::E w
1-
1 ············································································································································-·········································-·············································--····
0~-.mn~------~-.nn.-.--.-.~------~----~
5 10
OCTOBER -1991
1-SURFACE TEMPERATURE ··········· INTRAGRAVEL TEMP.
-24-
d
en w w a:
(!) w
0
I w a:
::::>
~ w a.
::! w
1-
FIGURE 21: TREEBAR REACH-NOV., 1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
6~------------------------------------------~
5 ······················································································································································-··············-····-·-································································
0
-1
s 10 1 20 25 30
NOVEMBER -1991
1-SURFACE TEMPERATURE ··········· INTRAGRAVEl TEMP.
-25-
.
0
(J) w w a:
C) w
Cl
I I
N w 0\
I a:
:::l
~ w
0..
::E w ....
1
1
8
4
2
0
FIGURE 22: TREEBAR REACH -1991
SURFACE & INTRAGRAVEL WATER TEMPERATURE
2~~--~~.-~~~--~~--~~~~~~--~~--~~~~~--• APR I MAY I JUN I JUL I AUG I SEP I -........ I ... M.
APRIL THROUGH NOVEMBER -1991
r=suRFACE-rEMPERArl.JRE ............. INTRAGRAVEL TEMP. 1
d
en
FIGURE 23: NORTH FORK -JULY, 1991
SURFACE WATER TEMPERATURE
12~--------------------~----------------~
H1 8 .... . .... ..... ..... ..... ... . ....... ............ ...... . .... . ... ·····-·-····-·· . .. .. ·--···-----·························-···-·················· ... ..
a:
ffi
Q
I w 6 ······················································· ···························· ................................... ············································-·····················································
a: :::>
~
~ 4 ............................................................................................... .................................... ·--··-································-········-·········· ............................... .
::! w
1--
2 ···············-············-······---···~···-····-····················-···-· .. ··-·····-···----··-·························································-·-·-··--······--···-·······················
5 10 1 20 2 30
JULY-1991
-27-
cj
en w w a:
C!J w
()
I
FIGURE 24: NORTH FORK -AUGUST, 1991
SURFACE WATER TEMPERATURE
12~----------------------------------------~
w 6 ··········································································-··························································································································· ..................... .
a:
:)
~
~ 4 ··············································································································································································································································
:! w
1-
2 ··············································································································································································································································
O~Dm---.mmmnnn.---~~mn----~--mm~.mnnnn~ 3'o 5 10 l 20 25
AUGUST-1991
-28-
d
ffi w a:
CJ w
Q
I
w a:
FIGURE 25: NORTH FORK -SEPTEMBER, 1991
SURFACE WATER TEMPERATURE
10~----------------------------------------~
9 ··································································--····································--······························································-·····-····························································
~ 4 .......................................................................................................................................................................................................................................... .
w
~ 3 ............................................................................................................................................................................................................................................. .
~ 2 ............................................................................................................................................................................................................................................. .
1 ............................................................................................................................................................................................................................................. .
5 10 15 20 25 30
SEPTEMBER -1991
-29-
d
FIGURE 26: NORTH FORK -OCTOBER, 1991
SURFACE WATER TEMPERATURE
10~----------------------------------------~
9 ............................................................................................................................................................. ·--···---·--··-·····················································
8 ······································-·····························································································································································-·······································
ffi 7 ·······················································································································································································-······················-···-······················
w a: fB 6 ................. ·····-·······················································································································································································-····················-··
0
I ~ 5 ................. ················································································································································································································
:::J
~ 4 ............................... ·················································································································································'············································
w a..
:::!
~
5
OCTOBER -1991
-30-
d
ffi w a:
fB
0
I
FIGURE 27: NORTH FORK -NOVEMBER, 1991
SURFACE WATER TEMPERATURE
5~--------------------------------------~
4 ..................................... .... . ............................................................................................................................................................................................... .
w 2 ...................................................................................................................................................................................................................................... .
a:
::l
~
~ 1 ················································--····························································-··································································--·-································--····················
~
~
5 10 15 20
NOVEMBER -1991
-31-
.
0
(/) w w a:
(!) w c I w I
1\J w I a: ::>
~ w a..
~ w t-
FIGURE 28: NORTH FORK BRAULt:Y M. -i 9;:, ~
SURFACE WATER TEMPERATURE
17~----------------------------------------------~
10
8 IUIIIIIIII 111111 lUI --1111 11-lln IIRftiii\UDIIIUIInl Ill I
6----------------
4
2
0
2' I --I AUG I SEP I OCT I NOV
JULY THROUGH NOVEMBER -1991
•
TABLE 1
surface water temperature and turbidity measurements collected
during the Salmon Escapement Monitoring Study downstream from
Treebar Reach.
~ Water Temperature (C •) Turbidity CHTU)
July 16 10.0 26
July 17 9.4 32
July 18 7.8
July 23 9.4 34
July 24 8.9 37
July 25 8.3 36
July 30 10.0 41
July 31 10.0
Aug. 1 9.4
Aug. 5 21
Aug. 6 8.3 30
Aug. 7 8.9 35
Aug. 8 8.9
Aug. 13 10.0
Aug. 14 10.0 37
Aug. 20 8.9
Aug. 21 9.4 42
Auq. 22 8.9 47
Aug. 27 7.8 40
Aug. 28 7.8 41
Aug. 29 7.8
Sep. 3 8.9
Sep. 4 9.4 35
Sep. 5 9.4
Sep. 10 9.4
Sep. 11 8.9 25
Sep. 12 8.3
-33-